Exsolution in clinoamphiboles
Science
By: M. Ross, J. J. Papike, and P.W. Weiblen
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Abstract
Ten amphibole specimens from a variety of metamorphic rocks such as talc schists, eclogites, and metamorphosed iron formations contain lamellae of a second amphibole oriented parallel to (101) or (100), or both, of the host. Tremolites, actinolites, and hornblendes commonly have lamellae of a calcium-poor clinoamphibole with P21/m space-group symmetry, or lamellae of citmmingtonite with C2/m space-group symmetry. Likewise ciimmingtonites and P21/m clinoamphiboles commonly contain lamellae of calcium-rich C2/m amphiboles such as tremolite. Results of x-ray diffraction, electron-probe, and microscope studies indicate that most lamellae result from unmixing of a homogeneous amphibole. The P21/m clinoampliibole is analogous to the clinopyroxene pigeonite in agreement with the results of M. G. Bown.
Suggested Citation
Ross, M., Papike, J.J., Weiblen, P., 1968, Exsolution in clinoamphiboles: Science, v. 159, no. 3819, p. 1099-1102.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Exsolution in clinoamphiboles |
| Series title | Science |
| Volume | 159 |
| Issue | 3819 |
| Year Published | 1968 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Science |
| First page | 1099 |
| Last page | 1102 |